One of my amps stopped working the other day so I checked the fuse on the side of the amp. It's a 20 amp fuse, and it should have blown, but it didn't. The fuse was burned and twisted inside but failed to break, so it allowed current to continue to flow into the amp after the fuse should have blown. I replaced the fuse and powered up the amp but it isn't working. The power light comes on for about a second and then it shuts down. Anyone have any idea what may have happened to the amp, and if it's possible or practical to repair it?